shardlow



(No Model.) 2 Sheets-Sheet 1. A SHARDLOW FILE CUTTING MACHINE.

Patent-ed Apr. 7, 1891.

FIG. I.

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UNITED STATES PATENT OFFICE.

AMBROSE SHARDLOW, OF SHEFFIELD, ENGLAND.

FILE-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 449,765, dated April 7,1891.

Application filed October 24, 1889. Serial No. 828,101. (No model.)Patented in England January 31, 1889, No. 1,699; in Italy August17,1889, No. 26,028; in Germany August 18, 1889, No. 50,649,- in FranceAugust 21. 1889, No. 200,314, and in Austria-Hungary December 2, 1889,No. 35,795.

To all whom it may concern.-

Be it known that I, AMBROSE SHARDLOW, residing at Sheffield, England, asubject of the Queen of Great Britain, have invented certain new anduseful Improvements in File- Outting Machines, (patented to mein Englandby Letters Patent No. 1,699, dated January 31, 1889; in Italy by LettersPatent No. 26,028, dated August 17, 1889; in Germany by Letters PatentNo. 50,649, dated August 18, 1889; in France by Letters Patent No.200,314, dated August 21, 1889, and in Austria-Hungary by Letters PatentNo. 35,795, dated December 2, 1889;) and I do hereby declare that thefol lowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, which form a part of thisspecification.

The objects of this invention are, first, to cause the chisel to strikeall parts of the file at the correct angle by automatically presentingthe tapered, beveled, or curved surface of such file to the action ofthe chisel at the same angle, or thereabout, as that at which the fiatpart of the file is presented; secondly, to enable the attendant toadjust the force of the blow of the chisel to suit the thin or weakparts of the file-such, for example, as the point; thirdly, to providean adjustable eccentric by which the feed-motion may be more accuratelyadjusted and have a greater range of action.

Figure 1 of the annexed drawings is a partly-sectionized front elevationof a file-cutting machine with my improvements. Fig.2 is apartly-sectionized side elevation of the same machine. Fig. 3 is a faceview of the adjustable eccentric.

Portions of the machine not connected with my invention have beenremoved to show the improvements more clearly, and similar letters andnumerals of reference indicate similar parts in any of the figures.

In carrying out my invention, to accomplish the first object I make thetraveling bed A (which carries the cradle B on which the file is fixed)in two chief parts 1 and 2. The upper part (marked 1) is jointed to thelower part (marked 2) at the bottom end in such a manner that it can beraised by theapplication of force, turning upon the axis 0. Upon theunder side of the part 1, which carries the cradle and file, I fix aremovable templet or path D of any desired taper or curve, preferablyfixed in the center, (butImay use two of such paths, if preferred, oneon each side,) and upon the bed E of the machine or on some part thereofand exactly under the line of the chisel (indicated by an arrow) I fix around-faced steel support F, which may, if desired, take the form of aroller or rollers; but I find a solid block, as shown, answers perfectlywell in practice. The face or under side of the path D rests uponrounded face of the block F, and will travel over it when set in motionby the feed-motion of the machine, which may be of any desiredconstruction, but is not shown in the drawings, so as to avoidcomplication.

As the traveling bed A, with the cradle B, is drawn up the face of thebed E by the feedmotion the path D will, according to its shape orcurves, raise or lower the part 1 upon its axis 0, and thus present theface of the file that is immediately under the cutter or chisel at theproper angle to form a correctly-shaped tooth.

In the drawings the path D is tapered backward, so that the part 1 wouldbe lowered as the traveling bed A was drawn up the face of the machine.

In order to enable the attendant to vary or reduce the force of the blowof the chisel when cutting the point of a file, (which requires alighter blow,) I adapt a spring-brake arrangement to the ram G, whichcarries the chisel. (Not shown.)

H H are two coiled springs,which act against the cross-head I on the ramG and give the chisel the requisite power or force to cut the file.

J J are the brake-springs encircling the bolts K, and capable, of beingraised or lowered by the cross-head L, upon which they rest, by means ofthe double arm M, which is connected with the foot-lever N by a shaftand any suitable arrangement of connectingrods and levers-such as OPpassing through the interior of the machine. If preferred, this brakemay be operated by hand instead of by foot. Thus when the chisel isrequired to strike a light blow the foot-lever N is moved so as to raisethe springs JJ and meet the cross-head I as it descends, counteractingor cushioning the action of the principal springs II and reducing theforce of the blow.

To obtain an extended range and a finer means of adjustment of theintermittent action of the feed-motion of such machines, I make theeccentric Q, which transmits the motion from the first shaft R to theratchet action of the feed mechanism, adjustable in its eccentricity inthe following manner: I make a face-plate S, provided with a slot T inits face, as seen in Fig. 3. This face-plate is fixed securely on theshaft R. The plate U has a projecting ring or barrel V, on which thestrap of the eccentric-rod W is fixed in the usual manner. This plate issecured upon the first-named plate S by short bolts, the heads of whichengage in the slot T, and it can thus be moved more or less from thecenter of the shaft, as required, to regulate the feed-motion.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is-- 1. In ii1e-cutting machines, the traveling bed A,having the movable upper part 1, proviced with the cradle B andremovable path D, in combination with a support F, located under theline of the chisel and coacting with said path to automatically raiseand lower the cradle, substantially as hereinbefore described.

2. In file-cutting machines, the cushioningsprings J and means forvarying their tension at will, in combination with the chisel-ram G andmain springs H, for the purposes set forth.

3. In file-cutting machines, the combination, with the first shaft R, ofthe adjustable eccentric Q, composed of the face-plate S, fast on saidshaft and provided with a diametrical slot T, and the movable plat-c U,attached to the face of said plate S by short bolts, the heads of whichwork in said slot T, and provided with a projecting ring or barrel V,embraced by the strap of the eccentric-rodWV,

substantially as shown and described, for the purpose set forth.

In testimony that I claim the foregoing as my own I have affixed heretomy signature, in presence of two witnesses, this 6th day of August,1889.

, AMBROSE SllARDLOlV.

\Vitnesses:

R0131". F. DRURY, BERNARD E. DRURY.

